Hydraulic responsive device

Claim 1

A by-pass, flow-through type, differential-pressure, fluidactuated indicating instrument, comprising in combination: a. a sealed, pressure casing constituted as a one-piece elongate block having expansive opposite outside surfaces, having opposite edge surfaces coextensive with said expansive outside surfaces, and having a longitudinal bore extending along and closely adjacent one of said edge surfaces, and further having ports located at opposite ends of the casing and connected with said bore by which fluid can be introduced into and discharged from the same, b. an apertured piston movably mounted in the bore and actuated by fluid passing therethrough, c. an annular permanent magnet having a pair of opposite and oppositely polarized annular edge portions, said magnet being connected with said piston to be actuated thereby, d. said block having a second bore extending transversely of said longitudinal bore and closely juxtaposed thereto, said bores being out of communication with each other e. a shaft turnably mounted on said block and extending into said second bore, f. a second permanent magnet having a north and a south pole, said magnet being disposed in the second bore and being carried on said shaft to be turnably movable therewith, g. said second magnet being in the field of influence of the said annular permanent magnet to be driven thereby as the piston in the casing is actuated by said fluid, h. a substantially flat dial having an expansive indicator surface, said dial being with its back disposed broadside against one of the expansive outside surfaces of the block, whereby a compact assemblage is had with a minimum amount of protrusion of the dial beyond the opposite edge surfaces of the casing, and i. a pointer carried by said shaft and movable over the expansive indicator surface of the dial to provide readings in connection therewith.